CN1083943C - Electronic cam compensation of pressure change of servo controlled pumps - Google Patents

Electronic cam compensation of pressure change of servo controlled pumps Download PDF

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Publication number
CN1083943C
CN1083943C CN97113710A CN97113710A CN1083943C CN 1083943 C CN1083943 C CN 1083943C CN 97113710 A CN97113710 A CN 97113710A CN 97113710 A CN97113710 A CN 97113710A CN 1083943 C CN1083943 C CN 1083943C
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CN
China
Prior art keywords
pump
pressure
motor
compensation
pressure curve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN97113710A
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Chinese (zh)
Other versions
CN1175664A (en
Inventor
E·J·谢弗
N·A·沃纳
J·J·汉迪兹尔
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Graco Inc
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Graco Inc
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Filing date
Publication date
Application filed by Graco Inc filed Critical Graco Inc
Publication of CN1175664A publication Critical patent/CN1175664A/en
Application granted granted Critical
Publication of CN1083943C publication Critical patent/CN1083943C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0041—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation by piston speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
    • F04B11/0058—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons with piston speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0201—Position of the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0213—Pulses per unit of time (pulse motor)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The construction and operation of the control of this invention is designed to minimize pressure changes at pump changeover by sampling pump pressure characteristics for each pump cycle, calculating a compensating motion profile and applying the profile to the motor which drives the pump. This control can be used with any pump which has the following characteristics: positive displacement, repeating cycle characteristics, rotary motor drive and an output pressure cycle curve which never falls to zero.

Description

The electronic stencil compensation that the servocontrol pumping pressure changes
The application is the part continuity of the U. S. application sequence number 60/018,552 of proposition on May 29th, 1996.
The present invention relates to the electronic stencil compensation of servocontrol pumping pressure warp.
Various types of pumps are used to carry and circulating liquid for many years.In many cases, desirable pump type is a kind of reciprocating pump, but one of them unfavorable aspect of this class reciprocating pump is, the output of this pump is easy to produce fluctuation, result or need compensation, or tolerate the existence of this fluctuation.A kind of reduce to fluctuate repay examination.See U. S. Patent 5,145,339, its content as a reference.Though generally speaking than the advanced design of other prior art, some fluctuations still exist this structure.
An object of the present invention is to provide a kind of reciprocating pump, the advantage of the reciprocating pump of not fluctuation, and maintenance basically.
According to an aspect of the present invention, a kind of multi cylinderpump is driven by a revolution motor, it is characterized in that this multi cylinderpump comprises:
To the device of each pump circuit pressure diagram sampling,
By described sampling apparatus calculate a compensatory pressure curve device and
Use the device that described compensatory pressure curve is controlled described motor.
According to other aspect of the present invention, a kind of method of control one multi cylinderpump, this multicylinder pump is driven by revolution motor, it is characterized in that, and this method comprises the following steps:
To each pump circuit pressure diagram sampling;
Calculate a compensatory pressure curve by described sampling apparatus; And
By using the described motor of described compensatory pressure curve controlled.
Other pump comprises that also there are some fluctuations at least in gear pump and cam pump.The present invention can be applicable to all these class pumps, to reduce fluctuation.
The operation of structure of the present invention and control is used for reducing variation in pressure when pump commutates, by in each pump circulation the pumping pressure characteristic being sampled, calculate a compensating motion template, and this template is applied to the motor of driven pump.In fact, this control can be used for appointing watches the pump that possesses following properties, positive displacement, and the reciprocation cycle characteristics, revolution motor drives and a delivery pressure cyclic curve never reduces to zero.
This control system can reduce the pressure surge in the pump commutation like this.It can also change the motion template with adapting to and compensates some change of state in addition, rate variation for example, changes in material (viscosity, etc.).It can also diagnose the operation of pump, fatigue and fault.
Mechanical means has been used in the examination of repaying of manufacturing ripple disable rear pump in the past, for example above-mentioned U. S. Patent 5,145,399.Compensatory pressure changes the examination of repaying done, and is that keep stabilizing torque load, these methods by electronically closing speed loop or on motor be to have counteractively, the trend of overcompensation is arranged, and because the inertia greatly of system has the trend of overcompensation and delay.When variation in pressure had comparatively faster fluctuation, particularly when pump reached high flow and high flow velocities, this situation was obvious especially, for reducing overcompensation, can reduce gain coefficient, but will be weakened and can not disappear thereupon fluctuation.
This solution, promptly continuous delivery pressure curve to pump is sampled and is calculated a correct compensating motion template, its objective is these two problems of solution.But change and diagnose the fatigue and the fault of disconnected pump by control continuous sampling compensating coefficient.By revising the motion template of pump simultaneously, can eliminate the overcompensation of pressure output with variation in pressure.Also have, but by adjusting the also mechanical hysteresis in the bucking-out system of this motion template of phase place.
These and other objects of the present invention and advantage can be from following descriptions, and in conjunction with the accompanying drawings, more fully embodied.Reference mark identical in the accompanying drawing is represented same or analogous parts in all a few width of cloth figure.
Fig. 1 is the control sketch of a pump of the present invention.
Fig. 2 is the plotted curve of a real response and the compensation response that calculates.
Fig. 3 is the plotted curve of a single compensation template.
Figure 1 shows that a system 10, comprise a low pulse double-piston pump 12, drive by a servomotor 14.Certainly, other pump or motor also can be used.The absolute position of pump 12 can be definite like this, and by the position that a proximity detector 16 is followed the tracks of each pump circuit pump, an encoder is determined the absolute position of the servomotor that is coupled to this pump then.
The instantaneous pressure of one pressure transducer, 18 monitoring pumps, 12 outputs.The pressure output relevant of one computer, 20 record pumps 12 with its absolute position.By analyzing one or more circuit pressure diagrams of pump, can determine a pressure diagram, as Fig. 2 about the position.Like this, can calculate compensation template (also seeing Fig. 2), be applied to motor and produce ripple disable output.
But this compensation analysis repeated application is in the continuous adjustment of system.By monitoring pressure continuously, any state that exceeds the pump characteristics normal range (NR) all can identify, but a suitable emergency alarm misdirection.In addition, ever-increasing compensation can be used as the sign of pump fatigue, and in a proper time, alarm promptly can be sounded.
Importantly single phase place is a characteristic of pump in advance.By observing operating lag for the output of the pressure crest input determined of being easy to be in operation, can determine this characteristic, for example output can lag behind one and import the X degree of motor/pump rotation.
In view of this, an independent compensation template can be applicable to most of pressure and descends, and its amplitude and length are by the pressure fall, and area and length determine that this will significantly reduce template in the required amount of calculation of real-Time Compensation.Fig. 3 can be corresponding to such compensation template.
It should be understood that this control system also can make various variations and modification, and do not break away from following determined the spirit and scope of the invention.

Claims (4)

1, a kind of multi cylinderpump is driven by a revolution motor, it is characterized in that this multi cylinderpump comprises:
To the device of each pump circuit pressure diagram sampling,
By described sampling apparatus calculate a compensatory pressure curve device and
Use the device that described compensatory pressure curve is controlled described motor.
2, multicylinder pump according to claim 1 is characterized in that further comprising the phase lag of compute control input and the device of the described hysteresis of compensation.
3, require 1 described multicylinder pump according to claim, it is characterized in that further comprising the device of the rotational position of determining described motor.
4, a kind of method of control one multi cylinderpump, this multicylinder pump is driven by revolution motor, it is characterized in that, and this method comprises the following steps:
To each pump circuit pressure diagram sampling;
Calculate a compensatory pressure curve by described sampling apparatus; And
By using the described motor of described compensatory pressure curve controlled.
CN97113710A 1996-05-29 1997-05-28 Electronic cam compensation of pressure change of servo controlled pumps Expired - Lifetime CN1083943C (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US863,115 1977-12-22
US863115 1977-12-22
US1855296P 1996-05-29 1996-05-29
US018552 1996-05-29
US018,552 1996-05-29
US08/863,115 US5971714A (en) 1996-05-29 1997-05-27 Electronic CAM compensation of pressure change of servo controlled pumps

Publications (2)

Publication Number Publication Date
CN1175664A CN1175664A (en) 1998-03-11
CN1083943C true CN1083943C (en) 2002-05-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN97113710A Expired - Lifetime CN1083943C (en) 1996-05-29 1997-05-28 Electronic cam compensation of pressure change of servo controlled pumps

Country Status (7)

Country Link
US (1) US5971714A (en)
EP (1) EP0810370B1 (en)
JP (1) JPH112187A (en)
KR (1) KR100475317B1 (en)
CN (1) CN1083943C (en)
DE (1) DE69729772T2 (en)
TW (1) TW365630B (en)

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US11214476B2 (en) 2006-03-06 2022-01-04 Deka Products Limited Partnership System and method for generating a drive signal
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CN104251201B (en) * 2013-06-28 2016-12-28 伊顿公司 The control system of pump based on converter and method and pumping system
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CN108171145B (en) * 2017-12-26 2020-08-28 迈克医疗电子有限公司 Flow control method and apparatus, analyzer, and computer-readable storage medium
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Also Published As

Publication number Publication date
EP0810370A2 (en) 1997-12-03
JPH112187A (en) 1999-01-06
EP0810370A3 (en) 1999-06-02
US5971714A (en) 1999-10-26
DE69729772D1 (en) 2004-08-12
EP0810370B1 (en) 2004-07-07
CN1175664A (en) 1998-03-11
DE69729772T2 (en) 2004-11-04
TW365630B (en) 1999-08-01
KR100475317B1 (en) 2005-06-02
KR970075367A (en) 1997-12-10

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